Revision of the Nearctic genus Tritoxa Loew (Diptera: Ulidiidae)
Author
Sinclair, Bradley J.
Canadian National Collection of Insects & Canadian Food Inspection Agency, OPL-Entomology, K. W. Neatby Bldg., C. E. F., 960 Carling Ave., Ottawa, ON, K 1 A 0 C 6, Canada
Author
Macleod, Alyssa M.
0000-0002-7048-8481
Department of Natural Resource Sciences, McGill University, Macdonald Campus, Ste-Anne-de-Bellevue, QC, H 9 X 3 V 9, Canada alyssa. m. macleod @ gmail. com; https: // orcid. org / 0000 - 0002 - 7048 - 8481
alyssa.m.macleod@gmail.com
Author
Wheeler, Terry A.
text
Zootaxa
2021
2021-01-29
4920
3
359
379
journal article
8337
10.11646/zootaxa.4920.3.3
3f20c135-c448-4c8c-a716-993e4f6d50d0
1175-5326
4478080
20794FBC-E83E-419F-945D-4F94C6F9A47C
Tritoxa californica
sp. nov.
(
Figs 6
,
14, 15
,
24
)
urn:lsid:zoobank.org:act:
0350D4DB-7407-4C19-941A-31B9951299EB
Type material.
HOLOTYPE
♂, labelled: “
CALIF
:
Plumas Co.
/
Little Long Valley
/
Creek
[
39°52′06″N
120°42′08″W
], 6000′
6 mi.
E./ Spring Garden/
VIII-4-10-1977
”; “
Malaise Trap
/ 8A-6P/
M. Wasbauer
/ Collector”; “
HOLOTYPE
/
Tritoxa
/
californica
Sinclair
,/ MacLeod & Wheeler” (
CSCA
)
.
PARATYPES
:
USA
.
California
:
El Dorado Co.
,
Pollack Pines
[
38°45′41″N
120°35′12″W
],
2.ix.1986
,
Jackson trap
, peach,
D. Bolster
(1♂,
CSCA
)
;
Nipa Co.
,
Angwin
,
38.575°N
122.453°W
,
17.ix.2008
,
McPhail trap
,
T
.
Samansky
(1♂,
1♀
,
CSCA
)
;
Same
data as holotype (1♂,
2♀
,
CSCA
)
;
Santa Cruz Co.
,
Big Basin SP
[
37°10′21″N
122°13′21″W
],
13.ix.1966
,
E.L. Sleeper
(1♂,
CAS
)
;
Trinity Co.
[
40.66°N
123.12°W
],
13.vi.1934
(1♂,
CAS
)
;
Tuolumne Co.
,
2.7 mi
E Smoky Jack
[
37°49′3.72″N
119°42′45.61″W
],
Summer
1962,
Frick trap
on
Prunus emarginata
, D.P. Allen
(1♂,
CSCA
)
.
Possible additional material.
USA
.
California
:
El Dorado Co.
,
Placerville
[
38°43′47″N
120°47′55″W
]
,
26.vi.1953
,
P.H. Arnaud
(1♂,
USNM
) [genitalia lost]; Sagehen Ck Field Stn.,
15 km
N
Truckee
,
39°25.89′N
120°14.61′W
,
16.viii.1999
,
J. Savage
(
1♀
,
LEM
);
Nevada
Co.,
Sagehen Ck
[
39°25′57″N
120°14′13″W
]
,
2.vii.1968
,
R
.
W. Pinger
(
1♀
,
USNM
)
.
Diagnosis.
This species has the general appearance of
Tritoxa cuneata
, but is distinguished by the short, oblique discal hyaline crossband not extending beyond level of crossvein r-m in cell dm, inner surstylus with tight cluster of 4–5 thick prensisetae and phallus is shorter, with two loops.
Description.
Entirely yellowish brown to brown, abdomen darker brown bands.
Head:
ocellar triangle dark brown to black, microtrichose; frons yellowish brown to brown; parafrontal silvery microtrichia stripe very narrow, limited to extreme margin of eye, continuous with very narrow microtrichose parafacial; gena slightly darker brown below narrowest part of lower eye margin; postocular microtrichia slightly wider than parafrontal microtrichose stripe in lateral view, extending from base to middle of eye; face concolourous with face laterally, slightly paler medially; supracervical setulae very pale. Antenna with postpedicel greyish brown, yellowish brown on inner and medially surfaces. Proboscis with yellowish brown palpus.
Thorax:
yellowish brown; scutum mostly thinly microtrichose without pair of vittae; lateral margin of scutum and postpronotal lobe broadly shiny; scutellum concolourous with scutum; mediotergite without distinct stripe; pleura shiny, anepisternum and katepisternum lightly clothed in whitish microtrichia when viewed obliquely; whitish microtrichia above fore coxa; 2 anepisternal setae.
Wing
(
Fig. 6
) entirely brown, slightly tapered apically, with 3 hyaline crossbands; some faded or paler regions between bands; costal cell without hyaline band at humeral break, with narrow hyaline band at extreme apex of cell in line with discal hyaline crossband; oblique subbasal hyaline crossband very short, extending to basal fifth of cell dm; discal hyaline crossband short, continuous from R
1
, reaching posterior margin of cell dm, not extending beyond level of crossvein r-m in cell dm; subapical hyaline crossband nearly straight, anterior end not extending proximal to crossvein r-m; crossvein dm-m straight to slightly arched; anal lobe developed; calypter with white margin.
Abdomen:
yellowish brown.
Male terminalia
(
Figs 14, 15
): inner surstylus with tight cluster of 4–5 thick prensisetae, inner margin concave; outer surstylus slender, slightly tapered and arched, slightly longer than length of inner surstylus, with narrow apex (
Fig. 10
); subepandrial sclerite with strong dark setae. Cercus with short setae; apical margin slightly pointed. Phallus short, with 2 loops.
Distribution.
This species is known exclusively from northern
California
(
Fig. 24
).
Remarks.
See comments under
T. cuneata
.